Method for purification of gas

Abstract

A catalyst for the purification of a gas containing ozone or a component of offensive odor is composed of (A) a composite oxide comprising (a) titanium and (b) at least one element selected from the group consisting of Si, Zr, and P and (B) at least one element selected from the group consisting of Mn, Fe, Co, Ni, Ag, Pt, Pd, and Rh.

What claimed is: 
     
       1. A method for the purification of an ozone-containing gas, which comprises passing said ozone-containing gas through a bed of a catalyst consisting of a component A composed of 95 to 10% by weight of a composite oxide and between 5 and 90% by weight of activated carbon said composite oxide comprising 20 to 95 mol% of (a) TiO 2  and 5 to 80 mol% of (b) at least one oxide selected from the group consisting of SiO 2 , ZrO 2  and P 2  O 5 . 
     
     
       2. A method of according to claim 1, wherein said component A is selected from the group consisting of TiO 2  --SiO 2 , TiO 2  --ZrO 2 , TiO 2  --P 2  O 5 , TiO 2  --SiO 2  --ZrO 2 , TiO 2  --SiO 2  --P 2  O 5 , TiO 2  --ZRO 2  --P 2  O 5 , and TiO 2  --SiO 2  --ZrO 2  --P 2  O 5 . 
     
     
       3. A method for the purification of an ozone-containing gas, which comprises passing said ozone-containing gas through a bed of the catalyst consisting of a component A composed of 95-10% by weight of a composite oxide containing (a) titanium and (b) at least one element selected from the group consisting of silicon, zirconium, and phosphorus, between 5 and 90% by weight of activated carbon, and a component B composed of at least one element selected from the groups consisting of manganese, iron, cobalt, nickel, silver, platinum, palladium, and rhodium, wherein the amount of said component B for a proportion in the range of not more than 150 by weight of oxide where said element selected if manganese, iron, cobalt, nickel or silver or in the range of not more than 10 parts by weight as metal where said element is platinum, palladium, or rhodium, respectively based on 100 parts by weight of said component A as oxide, thereby effecting decomposition of the ozone in said gas. 
     
     
       4. A method for the purification of a gas containing a component of offensive odor, selected from the group consisting essentially of hydrogen sulfide, methyl sulfide, methyl mercaptan, methyl disulfide, ammonia, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, isobutylamine, pyridine, acetone, methylethylketone, butyric acid, acetaldehyde, acrolein, phenol, benzene, xylene, toluene, and butenes, which comprises combining said gas with ozone to a level of 1 to 10 mol per mol of component to offensive odor and passing the resultant mixed gas through a bed of a catalyst comprising a component A composed of 95 to 10% by weight a composite oxide containing (a) 20 to 95 mol% of TiO 2 , and (b) 5-80 mol% of at least one element selected from the group consisting of silicon, zirconium, and phosphorus and a component B composed of at least one element selected from the group consisting of manganese, iron, cobalt, nickel, silver, platinum, palladium, and rhodium, wherein the amount of said component B for a proportion is in the range of not more than 150 parts by weight as oxide where said element selected is manganese, iron, cobalt, nickel, or silver or in the range of not more than 10 parts by weight as metal where said element is platinum, palladium, or rhodium, respectively based on 100 parts by weight of said component A as oxide thereby effecting decomposition and removal of said component of offensive odor by the ozone. 
     
     
       5. A method for the purification of a gas containing a component of offensive odor, selected from the group consisting essentially of hydrogen sulfide, methyl sulfide, methyl mercaptan, methyl disulfide, ammonia, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, isobutylamine, pyridine, acetone, methylethylketone, butyric acid, acetaldehyde, acrolein, pheon, benzene, xylene, toluene, and butenes, which comprises combining said gas with ozone to a level of about 1 to 10 mol ozone per mol of components having offensive odor and passing the resultant mixed gas through a bed of the catalyst consisting of a component A composed of 95-10% by weight of a composite oxide containing (a) titanium and (b) at least one elment selected from the group consisting of silicon, zirconium, and phosphorus, between 5 and 90% by weight of activated carbon, and a component B composed of at least one element selected from the group consisting of manganese, iron, cobalt, nickel, silver, platinum, palladium, and rhodium, wherein the amount of said component B for a proportion in the range of not more than 150 by weight of oxide where said element selected if manganese, iron, cobalt, nickel or silver or in the range of not more than 10 parts by weight as metal where said element is platinum, palladium, or rhodium, respectively based on 100 parts by weight of said component A as oxide thereby effecting removal of said component of offensive odor by the ozone. 
     
     
       6. A method for the purification of an ozone-containing gas, which comprises passing said ozone-containing gas through a bed of the catalyst consisting of a component A composed of 95 to 10% by weight a composite oxide containing (a) 20 to 95 mol% TiO 2  and 5 to 80 mol% of (b) at least one element selected from the group consisting of silicon, zirconium, and phosphorus, and a component B composed of at least one element selected from the group consisting of manganese, iron, cobalt, nickel, silver, platinum, palladium, and rhodium, wherein the amount of said component B for a proportion is in the range of not more that 150 parts by weight of oxide where said element selected is manganese, iron, cobalt, nickel or silver or in the range of not more than 10 parts by weight as metal where said element is platinum, palladium or rhodium, respectively based on 100 parts by weight of said component A as oxide, thereby effecting decomposition of the ozone in said gas. 
     
     
       7. A method for the purification of a gas containing a component of offensive odor, selected from the group consisting essentially of hydrogen sulfide, methyl sulfide, methyl mercaptan, methyl disulfide, ammonia, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, isobutylamine, pyridine, acetone, methylethylketone, butyric acid, acetaldehyde, acrolein, phenol, benzene, xylene, toluene, and butenes, which comprises i) deodorizing said gas by passing it through a bed of catalyst comprising a component consisting of a component A composed of a composite oxide containing (a) titanium, and (b) at least one element selected from the group consisting of silicon, zirconium, and phosphorus and a component B composed of at least one element selected from the group consisting of manganese, iron, cobalt, nickel, silver, platinum, palladium, and rhodium, wherein the amount of said component B for a proportion is in the range of not more than 150 parts by weight as oxide where said element selected is manganese, iron, cobalt, nickel, or silver or in the range of not more than 10 parts by weight as metal where said element is platinum, palladium, or rhodium, respectively based on 100 parts by weight of said component A as oxide   ii) removing said catalytic bed from the gas stream the bed having absorbed thereon said component of offensive odor and   iii) introducing ozone intermittently into the catalyst bed while removed from the gas stream to decompose said component of offensive odor and regenerate said bed.   
     
     
       8. A method according to claim 7, wherein said component A is selected from the group consisting of TiO 2  --SiO 2 , TiO 2  --ZrO 2 , TiO 2  --P 2  O 5 , TiO 2  --SiO 2  --ZeO 2 , TiO 2  --SiO 2  --P 2  P 5 , TiO 2  --ZrO 2  --P 2  O 5 , and TiO 2  --SiO 2  --ZrO 2  --P(hd 2O 5 . 
     
     
       9. A method according to claim 8, wherein said component A comprises 20 to 95 mol% of TiO 2  and 5 and 80 mol% of at least one oxide selected from the group consisting of SiO 2 , ZrO 2  and P 2  O 5 . 
     
     
       10. A method according to claim 7 wherein said catalyst consists of a component A composed of 95-10% by weight of an oxide containing (a) 20 to 95 mol% by weight of an oxide containing (a) 20 to 95 mol% TiO 2  and (b) 5-80 mol% of the oxide of at least one element selected from the group consisting of silicon, zirconium, and phosphorus, between 5 and 95% by weight of activated carbon and a component B composed of at lest one element selected from the group consisting of manganese, iron, cobalt, nickel, silver, platinum, palladium, and rhodium, wherein the amount of said component B for a proportion in the range of not more than 150 parts by weight as oxide where said element selected is manganese, iron, cobalt, nickel, or silver or in the range of not more than 10 parts by weight as metal where said element is platinum, palladium, or rhodium, respectively based on 100 parts by weight of said component A as composite oxide.